UV Index in Si Ma Cai, Vietnam

Last updated: August 1, 2025

Understanding the UV Index is crucial for residents and visitors in Si Ma Cai, Vietnam, where the unique climate can expose people to significant levels of ultraviolet radiation. As the UV Index can soar to a high of 15 during midday, being aware of these levels is essential for preventing sunburn and protecting skin health. With Si Ma Cai's Cwa climate, marked by its distinct seasons, inhabitants should remain vigilant about UV exposure risks, especially during the peak times of the day when the sun's rays are the strongest. Stay informed and safeguard your skin while enjoying the stunning landscapes of this remarkable region!

Hourly UV Index in Si Ma Cai

As the sun rises, the UV Index begins its ascent, starting from a modest 2 at 07:00. By 08:00, it jumps to 4, a sign that the day is warming up. The real intensity hits at 10:00, soaring to a striking 11. The peak is reached at 12:00, with a blistering 15, before gradually tapering off through the afternoon. At 13:00, it dips slightly to 13, and by 14:00, it's down to 11. As the day winds down, the index decreases further, resting at 7 by 15:00 and gradually falling to 1 by 18:00, finally settling at 0 by 19:00. It's a vivid reminder of the sun's power and the importance of sun protection during the peak hours!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	3	moderate	30 min
09:00	7	high	25 min
10:00	10	very high	15 min
11:00	13	extreme	10 min
12:00	14	extreme	10 min
13:00	13	extreme	10 min
14:00	10	very high	15 min
15:00	7	high	25 min
16:00	3	moderate	30 min
17:00	1	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Si Ma Cai

The UV Index experiences significant seasonal changes, peaking during the warmer months. From January to April, the index starts off high at 8 and escalates to 13 by April. However, the most critical period for UV exposure arrives in May through October, where the index remains between 14 and 15, categorized as extreme with a burn time of just 10 minutes. July marks the highest UV Index at 15, making it a particularly high-risk month for sunburn. As we transition to November and December, the index decreases to 9 and 8 respectively, returning to a very high exposure category but allowing a longer burn time of 15 minutes. Visitors and residents are strongly advised to take precautionary measures, especially from March to October, to minimize UV exposure by seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen regularly.

Monthly Maximum UV Index for Si Ma Cai, Vietnam

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Si Ma Cai. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Si Ma Cai, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Si Ma Cai UV Index with Other Vietnam Cities

The table above highlights how UV exposure in Si Ma Cai compares to other major locations across Vietnam. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Si Ma Cai's solar exposure compared to other cities in Vietnam. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Hanoi UVI	8	10	12	12	13	12	12	13	13	11	9	7
Haiphong UVI	8	10	12	13	12	13	13	13	13	11	9	7
Si Ma Cai	8	10	12	13	14	14	15	14	13	12	9	8
Da Nang UVI	10	12	14	15	14	13	14	14	13	12	10	9
Ho Chi Minh City UVI	10	13	15	14	14	12	13	14	13	13	11	10
Bien Hoa UVI	10	14	15	15	14	13	14	14	13	12	11	10